Is there a way/app to stope app download from the store?

HI,
I want an a way/app that prevents/stops downloading any app from the play-store. I would like the app to stop app-download permanently. It does not ask for password for exception.

My goal is I am giving a tablet to my employees, I want the employees to focus on already-installed app by me. I want to prevent them from downloading any app out of the business.

Thank you